Organic display device

ABSTRACT

The present inversion provides an organic display device comprising at least infrared display pixel, the infrared display pixel includes a transparent substrate which is deposited with a first electrode layer, an infrared organic light emitting layer and a second electrode layer thereon, and the infrared organic light emitting layer is filled with an infrared light emitting material. The present invention can allow the organic display device to carry out large area of infrared display; and the present invention uses the flexible transparent substrate, so as to conveniently use and carry the organic display device.

FIELD OF THE INVENTION

The present invention relates to a technical field of organic display,and more particularly to an organic display device.

BACKGROUND OF THE INVENTION

Organic Light Emitting Diode (OLED) is used as a new generation oflighting display device, wherein organic light emitting materials aresandwiched between a transparent anode and a metal reflective cathode,and a voltage can be applied on the organic light emitting materials toemit light. Because the OLED does not need a backlight device, it can bemanufactured more compact. In comparison with other types of paneldisplay device, the electric power consumption of OLED is lower, and theOLED can work in a broader temperature range, and manufacturing costthereof is lower, so that it can be used more widely. And, by usingorganic light emitting materials of different colors, the OLED candisplay different colors, such as provide red, green, blue light and soon.

With the growing popularity of the infrared (IR) equipment, therequirements of the infrared applications are also increasing. Theinfrared equipment of the prior art is generally used in the field ofheating, physical therapy, night vision, communication, navigation,plant cultivation, high-temperature sterilization, infrared detectionand infrared guidance and so on, and the existence form of infraredequipment includes xenon gas lamp, heated object or laser device and soon. The infrared display of the above-mentioned forms only can be usedfor lighting, but unable to carry out large area of infrared display.

Although the inorganic semiconductor infrared generator in the prior artcan be used to carry out large area of infrared display, used inorganicsemiconductor material thereof is Te—Cd—Hg based inorganic compoundswhich has higher cost and more complicated production process, unable toform a thin film on polycrystalline Si, amorphous Si and a flexibleplastic substrate, and is inconvenience for carrying by a user, so thatthose problems restrict the application of the inorganic infraredsemiconductor material in infrared display device.

Compared to inorganic infrared semiconductor materials, the organicinfrared material (such as infrared organic semiconductor materials) hasadvantages of low price and light weight, good solubility, easy to beprocessed into large area flexible display and able to be regulate thephotoelectric properties through molecular tailoring and so on.

Therefore, it is one of the technical direction in the field of researchto think how to apply the organic infrared materials to the organicdisplay device which thus can achieve infrared display, reduce costs andincrease operation convenience for users.

SUMMARY OF THE INVENTION

An object of the present invention is to provide an organic displaydevice, wherein organic infrared materials are applied to the organicdisplay device, so as to achieve infrared display, reduce costs andincrease operation convenience for users.

To achieve above beneficial effects, the present invention constitutingan organic display device, which includes at least one infrared displaypixel, the infrared display pixel comprises a flexible transparentsubstrate which is deposited with a first electrode layer, an infraredorganic light emitting layer and a second electrode layer thereon, andthe infrared organic light emitting layer is filled with an infraredlight emitting material;

wherein the transparent substrate is formed with scan lines, data lines,power lines and switch array elements, the infrared display pixelconnects to the scan line, the data line and the power line through theswitch array element, and the infrared display pixel is switched on oroff according to signals of the scan line, the date line and the powerline.

In one embodiment of the present invention, the infrared light emittingmaterial is trivalent rare-earth ion complex, phthalocyanine-basedmaterial or porphyrin-based material.

In one embodiment of the present invention, the infrared light emittingmaterial is organic polymer or organic ionic dye.

In one embodiment of the present invention, a first protective layer isformed between the transparent substrate and the first electrode layer.

In one embodiment of the present invention, a hole transport layer isformed between the first electrode layer and the infrared organic lightemitting layer, and an electron transport layer is formed on the secondelectrode layer.

In one embodiment of the present invention, a hole blocking layer isformed between the electrode transport layer and the second electrodelayer.

In one embodiment of the present invention, the infrared display pixelcomprises a second protective layer, a protective space is formedbetween the second protective layer and the first protective layer, andall of the first electrode layer, the hole transport layer, the infraredorganic light emitting layer, the hole blocking layer and the electrodetransport layer are in the protective space.

In one embodiment of the present invention, the first protective layercomprises at least one layer polymer layer and the cutoff layer, and thepolymer layer superimposed setting with the cutoff layer alternately.

Another object of the present invention is to provide an organic displaydevice, wherein an organic infrared material is applied to the organicdisplay device, so as to achieve infrared display, reduce costs andincrease operation convenience for users.

To achieve beneficial effects of above, the present invention providesan organic display device, which comprises at least one infrared displaypixel, the infrared display pixel includes a transparent substrate whichis deposited with the first electrode layer, an infrared organic lightemitting layer and a second electrode layer thereon, and the infraredorganic light emitting layer is filled with an infrared light emittingmaterial.

In one embodiment of the present invention, the transparent substrate isa flexible transparent substrate.

In one embodiment of the present invention, the infrared light emittingmaterial is trivalent rare-earth ion complex, phthalocyanine-basedmaterial or porphyrin-based material.

In one embodiment of the present invention, the infrared light emittingmaterial is organic polymer or organic ionic dye, wherein the band gapof the organic polymer is within a predetermined range.

In one embodiment of the present invention, a first protective layer isformed between the transparent substrate and the first electrode layer.

In one embodiment of the present invention, a hole transport layer isformed between the first electrode layer and the infrared organic lightemitting layer, and an electron transport layer is also formed on thesecond electrode layer.

In one embodiment of the present invention, a hole blocking layer isformed between the first electrode layer and the second electrode layer.

In one embodiment of the present invention, the infrared display pixelcomprises a second protective layer, the second protective layer and thefirst protective layer is formed with a protective space therebetween,all of the first electrode layer, the hole transport layer, the infraredorganic light emitting layer, the hole blocking layer and the electrontransport layer are in the protective space.

In one embodiment of the present invention, the first protective layercomprises at least one polymer layer and at least one cutoff layer, andthe polymer layer and the cutoff layer are alternately superimposed witheach other.

In one embodiment of the present invention, the transparent substrate isformed with scan lines, data lines, power lines and switch arrayelements, the infrared display pixel connects to the scan line, the dataline and the power line through the switch array element, and theinfrared display pixel is switched on or off according to signals fromthe scan line, the date line and the power line.

Compared with the existing technology, the present invention fills theinfrared light emitting material into the organic light emitting layerof the organic display device to be used as the infrared organic lightemitting layer, and uses the flexible transparent substrate to allow theorganic display device to be able to carry out large area of infrareddisplay, while production process can be simplified and manufacturingcost can be lowered. Because the present invention uses the transparentsubstrate, it is possible to manufacture the organic display device as aclothing and the like, which is thus easy to be used and carried, sothat the function of the organic display device can be greatly expandedand the user's experience can be enhanced.

The above content of the present invention can be best understood byreferring to the following detailed description of the preferredembodiments and the accompanying drawings.

DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic top view of a structure of an organic displaydevice of the present invention;

FIG. 2 is a cross-sectional schematic view of a structure of an infrareddisplay pixel of the present invention.

FIG. 3 is a cross-sectional schematic view of a structure of a firstprotective layer of the present invention.

FIG. 4 is a schematic view of a control structure of the organic displaydevice of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The structure and the technical means adopted by the present inventionto achieve the above and other objects can be best understood byreferring to the following detailed description of the preferredembodiments and the accompanying drawings. Furthermore, directionalterms described by the present invention, such as upper, lower, front,back, left, right, inner, outer, side, longitudinal/vertical,transverse/horizontal, and etc., are only directions by referring to theaccompanying drawings, and thus the used directional terms are used todescribe and understand the present invention, but the present inventionis not limited thereto.

Referring now to FIG. 1, FIG. 1 represents a schematic top view, whereinthe organic display device 10 comprises the infrared display pixel 11arrange through a plurality of along row direction A (is the lengthdirection) and column direction B (is width direction), the infrareddisplay pixel 11 is used for emitting infrared (IR) light, thewavelength of infrared light is generally between 0.76 and 400micrometer, the light can not be seen by the naked eyes, so it needs thespecial instruments to observe the infrared light, but the detailsthereof are omitted herein.

Referring to FIG. 2, FIG. 2 represents a cross-sectional structureschematic view of the infrared display device 11 in FIG. 1.

The infrared display pixel 11 comprises the transparent substrate 20,the transparent substrate 20 is sequentially formed with a firstprotective layer 21, an electrode layer 22 (anode), a hole transportlayer 23, an infrared organic light emitting layer 24, a hole blockinglayer 25, an electron transport layer 26, a second electrode layer 27and a second protective layer 28.

The second protective layer 28 has closed bent shape relative to thefirst protective layer 21, and is formed with a protective space withthe first protective layer (not show in figure), the protective spaceencapsulates the first electrode layer 22, the hole transport layer 23,the infrared organic light emitting layer 24, the hole blocking layer25, the electrode transport layer 26 and the second protective layer 27therein to achieve the protective effect.

The infrared organic light emitting layer 24 comprises the infraredlight emitting material, the infrared light emitting material ispreferably selected from the trivalent rare earth ionic complex, thephthalocyanine-based material or the porphyrin-based material, or alsocan be organic polymer or organic ionic dye, wherein the band gap of theorganic polymer (the energy difference between the lowest point of theconduction band and the highest point of the valence band) is in thepredefined range, e.g. the range is ranged from 0.50 electron volts to1.50 electron volts.

The infrared light emitting material is exemplified by copperphthalocyanine material, wherein the structure of the copperphthalocyanine is represented by the formula (I), the emission spectrumpeak of the copper phthalocyanine is at 1120 nanometer (nm); theinfrared light emitting material is exemplified by tris(8-hydroxyquinoline) erbium, the structure of the tris(8-hydroxyquinoline) erbium is represented by the formula (II), theemission spectra peak of tris (8-hydroxyquinoline) erbium is at 1530nanometer.

In the present invention, the transparent substrate 20 is preferablyselected from a flexible transparent substrate, such as polyethyleneterephthalate, PET or stainless steel foil.

Referring to FIG. 3, FIG. 3 represents a cross-sectional structureschematic view of the first protective layer 21 in FIG. 1.

Because the transparent substrate 20 is preferably selected from theflexible transparent substrate, the first protective layer 21 is formedto prevent the other substance from entering the infrared display pixel11, such as can be waterproof. The first protective layer 21 includes atleast one layer of polymer layer 211 and the cutoff layer 212, such ascompact inorganic cutoff layer. The polymer layer 211 and the cutofflayer 212 are alternately superimposed with each other.

The materials of the polymer layer 211 can be polyxylenes, polyolefins,polyesters, or polyimide (PI) and so on. For example, the type ofpolyparaxylene is PPX (polyparaxylene) or PCPX (poly-chlorine xylene);the class of polylefin is PE (polyethylene), PS (polystyrene), PP(polypropylene), PET, PTFE (polytetrafluoroethylene) or PFA (solublePTFE); the polyester is PEN (polyethylene terephthalate), PC(polycarbonate), PMMA (poly(methyl methacrylate)), PVAC (poly(vinyacetate)) or PES (polyethersulfone resin).

And the material of the cutoff layer 212 can be a transparent oxidefilm, transparent fluoride film, silicon nitride family (Si_(x)N_(y)) orchalcogenide glasses. The transparent oxide film such as titaniumdioxide (TiO₂), magnesium oxide (MgO), silicon dioxide (SiO₂), zirconiumdioxide (ZrO₂), zinc oxide (ZnO) or aluminum oxide (Al₂O₃); thetransparent fluoride film can be lithium fluoride (LiF), magnesiumfluoride (MgF₂); the silicon nitride family (Si_(x)N_(y)) can be (Si₃N₄)or (SiN_(x)); the chalcogenide glasses can be glass of selenium (Se),tellurium (Te) or antimony (Sb). Certainly, the materials of the cutofflayer 212 can be zinc sulfide (ZnS), SiO_(x)N_(y) or SiO_(x)C_(y).

Referring still to FIG. 2, the first electrode layer 22 can be indiumtin oxide (TiO), the second electrode layer 27 can be an alloy ofmagnesium and silver. In the bias voltage conditions, the electrons fromthe second electron layer 27 and the holes (so-called the electron hole)from the first electron layer 22 are recombined in the infrared organiclight emitting layer 24, so that the infrared organic light emittinglayer 24 emits infrared light, wherein the infrared light equipment(not-shown) can observe infrared light emitted from the infrared organiclight emitting layer 24 through the transparent substrate 20, the firstprotective layer 21, the first protective layer 22 and the holetransport layer 23. Because the infrared organic light emitting layer 24is a flat plane light source in the present invention, the organicdisplay device can be used as a large area display device of infraredlight.

Referring to FIG. 4, FIG. 4 represents the control structure schematicview of the organic display device in the present invention.

The transparent substrate (not show in FIG. 4) is formed with the scanlines 31, the data lines 32, the power lines 33 and the thin filmtransistors (TFT) 34. The scan line 31 and data line 32 are intersectedto define a region to form the infrared display pixel 11, wherein thedata line 32 and the power line 33 are dispose on both sides of theinfrared display pixel 11. The infrared display pixel 11 in the presentinvention connects to the scan line 31, the data line 32 and the powerline 33 through the TFT 34. The organic display device also comprises adriving module to drive the infrared display pixel 11 to emit theinfrared light. For example, the driving module can be a gate drivingchip and a source driving chip (not show in figure), which connect tothe scan line 31 and the data line 32, respectively, to provide thescanning signal for scan line 31 and provide the data signal for dataline 32, wherein the infrared display pixel 11 is switched on or offaccording to the signal from the scan line 31, the data line 32 and thepower line 33.

In the present invention, the organic light emitting layer of theorganic display device is filled with the infrared light emittingmaterial as the infrared organic light emitting layer, and the flexibletransparent substrate is used, so that the organic display device isable to carry out large area display of the infrared light, whileproduction process can be simplified and manufacturing cost can belowered; Because the present invention uses the transparent substrate,it is possible to manufacture the organic display device as a clothingand the like, which is thus easy to be used and carried, so that thefunction of the organic display device can be greatly expanded and theuser's experience can be enhanced.

It is also clear that, although the present invention has been describedwith reference to some examples, a person of skill in the art shall beable to achieve equivalent forms, having the characteristics as setforth in the claims and hence all coming within the field of protectiondefined thereby.

What is claimed is:
 1. An organic display device, comprising at leastone infrared display pixel, wherein the infrared display pixel comprisesa flexible transparent substrate which is deposited with a firstelectrode layer, an infrared organic light emitting layer and a secondelectrode layer thereon, and the infrared organic light emitting layeris filled with an infrared light emitting material; wherein thetransparent substrate is formed with scan lines, data lines, a powerlines and switch array elements, the infrared display pixel connects tothe scan line, the date line and the power line through the switch arrayelement, and the infrared display pixel is switched on or off accordingto signals from the scan line, the date line and the power line.
 2. Theorganic display device according to claim 1, wherein the infrared lightemitting material is a trivalent rare-earth ion complex, aphthalocyanine-based material or a porphyrin-based material.
 3. Theorganic display device according to claim 1, wherein the infrared lightemitting material is organic polymer or organic ionic dye.
 4. Theorganic display device according to claim 1, wherein a first protectivelayer is formed between the transparent substrate and the firstelectrode layer.
 5. The organic display device according to claim 4,wherein a hole transport layer is formed between the first electrodelayer and the infrared organic light emitting layer, and an electrontransport layer is formed on the second electrode layer.
 6. The organicdisplay device according to claim 5, wherein a hole blocking layer isformed between the electron transport layer and the second electrodelayer.
 7. The organic display device according to claim 6, wherein theinfrared display pixel further comprises a second protective layer, aprotective space is formed between the second protective layer and thefirst protective layer, all of the first electrode layer, the holetransport layer, the infrared organic light emitting layer, the holeblocking layer and the electron transport layer are in the protectivespace.
 8. The organic display device according to claim 4, wherein thefirst protective layer comprises at least one polymer layer and at leastone cutoff layer, and the polymer layer and the cutoff layer arealternately superimposed with each other.
 9. An organic display device,comprising at least one infrared display pixel, wherein the infrareddisplay pixel comprises a transparent substrate which is deposited witha first electrode layer, an infrared organic light emitting layer and asecond electrode thereon, and the infrared organic light emitting isfilled with an infrared light emitting material.
 10. The organic displaydevice according to claim 9, wherein the transparent substrate is aflexible transparent substrate.
 11. The organic display device accordingto claim 9, wherein the infrared light emitting material is a trivalentrare-earth ion complex, a phthalocyanine-based material or aporphyrin-based material.
 12. The organic display device according toclaim 9, wherein the infrared light emitting material is organic polymeror organic ionic dye.
 13. The organic display device according to claim10, wherein a first protective layer is formed between the transparentsubstrate and the first electrode layer.
 14. The organic display deviceaccording to claim 13, wherein a hole transport layer is formed betweenthe first electrode layer and the infrared organic light emitting layer,and the electron transport layer is formed on the second electrodelayer.
 15. The organic display device according to claim 14, wherein ahole blocking layer is formed between the electron transport layer andthe second electrode layer.
 16. The organic display device according toclaim 15, wherein the infrared display pixel comprises a secondprotective layer, a protective space is formed between the secondprotective layer and the first protective layer, all of the firstelectrode layer, the hole transport layer, the infrared organic lightemitting layer, the hole blocking layer and the electron transport layerare in the protective space.
 17. The organic display device according toclaim 13, wherein the first protective layer comprises at least onepolymer layer and at least one cutoff layer, and the polymer layer andthe cutoff layer are alternately superimposed with each other.
 18. Theorganic display device according to claim 9, wherein the transparentsubstrate is formed with scan lines, data lines, power lines and switcharray elements, the infrared display pixel connects to the scan line,the data line and the power line through the switch array element, andthe infrared display pixel is switched on or off according to signalsfrom the scan line, the date line and the power line.